[PATCH] pwm - Fix possible NULL derefrence.

[Thierry Reding]

On Mon, Jan 30, 2017 at 10:22:33AM +0530, Shailendra Verma wrote:
> of_match_device could return NULL, and so can cause a NULL
> pointer dereference later.
> 
> Signed-off-by: Shailendra Verma <shailendra.v at samsung.com>
> ---
>  drivers/pwm/pwm-sun4i.c |    4 ++++
>  drivers/pwm/pwm-tegra.c |    5 +++++
>  2 files changed, 9 insertions(+)

Both of these drivers will only run on purely OF systems, so this check
is unnecessary.

Thierry
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